Spring Batch_Configuring Skip Logic

Spring Batch_Configuring Skip Logic

spring 官方文檔：http://docs.spring.io/spring-batch/trunk/reference/html/configureStep.html#configuringSkip

當spring batch 處理過程當中，可能要發生錯誤，就會致使整個批處理過程的失敗，而有些錯誤不該該致使整個批處理的失敗，那麼經過配置 ‍‍‍‍‍‍‍‍‍‍‍‍ <skippable-exception-classes> ‍‍‍‍‍‍‍‍‍‍‍‍能夠忽略掉某些錯誤，從而使 批處理繼續運行。

下面是我主要的處理skip邏輯的配置：

<!-- add people desc job begin -->
<batch:job id="addPeopleDescJob">
	<batch:step id="addDescStep" parent="abstractStep">
		<batch:tasklet>
			<batch:chunk reader="peopleAddDescReader" processor="allowSkipProcessor"
				writer="addDescPeopleWriter" commit-interval="2" skip-limit="10">
				<batch:skippable-exception-classes>
					<!--batch:include配置容許發生的異常 -->
					<batch:include class="com.lyx.batch.InvalidDataException" />
				</batch:skippable-exception-classes>
			</batch:chunk>
		</batch:tasklet>
	</batch:step>
</batch:job>
<!-- add people desc job end -->

其中下面這段配置是配置的要忽略的異常：

<batch:skippable-exception-classes>
	<!--batch:include配置容許發生的異常 -->
	<batch:include class="com.lyx.batch.InvalidDataException" />
</batch:skippable-exception-classes>

 

下面是完整的配置：

<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:batch="http://www.springframework.org/schema/batch"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.0.xsd
		http://www.springframework.org/schema/batch http://www.springframework.org/schema/batch/spring-batch.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd">
	<!-- 包的掃描 -->
	<context:component-scan base-package="com.lyx.batch" />

	<bean id="exceptionHandler" class="com.lyx.batch.ExceptionListener" />

	<batch:step id="abstractStep" abstract="true">
		<batch:listeners>
			<batch:listener ref="exceptionHandler" />
		</batch:listeners>
	</batch:step>
	<bean id="abstractCursorReader" abstract="true"
		class="org.springframework.batch.item.database.JdbcCursorItemReader">
		<property name="dataSource" ref="dataSource" />
	</bean>

	<!-- add people desc job begin -->
	<batch:job id="addPeopleDescJob">
		<batch:step id="addDescStep" parent="abstractStep">
			<batch:tasklet>
				<batch:chunk reader="peopleAddDescReader" processor="allowSkipProcessor"
					writer="addDescPeopleWriter" commit-interval="2" skip-limit="10">
					<batch:skippable-exception-classes>
						<!--batch:include配置容許發生的異常 -->
						<batch:include class="com.lyx.batch.InvalidDataException" />
					</batch:skippable-exception-classes>
				</batch:chunk>
			</batch:tasklet>
		</batch:step>
	</batch:job>
	<!-- add people desc job end -->

	<bean id="peopleAddDescReader" parent="abstractCursorReader"
		scope="step">
		<property name="sql">
			<value><![CDATA[select first_name ,last_name from people where 
			first_name like ? or last_name like ?]]></value>
		</property>
		<property name="rowMapper" ref="peopleRowMapper" />
		<property name="preparedStatementSetter" ref="preparedStatementSetter" />
		<property name="fetchSize" value="20" />
	</bean>
	<bean id="peopleRowMapper" class="com.lyx.batch.PeopleRowMapper" />
	<bean id="preparedStatementSetter" class="com.lyx.batch.PeoplePreparedStatementSetter" />
	<bean id="allowSkipProcessor" class="com.lyx.batch.AllowSkipProcessor" />
	<bean id="addDescPeopleWriter" class="com.lyx.batch.AddDescPeopleWriter" />

	<!--tomcat jdbc pool數據源配置 -->
	<bean id="dataSource" class="org.apache.tomcat.jdbc.pool.DataSource"
		destroy-method="close">
		<property name="poolProperties">
			<bean class="org.apache.tomcat.jdbc.pool.PoolProperties">
				<property name="driverClassName" value="com.mysql.jdbc.Driver" />
				<property name="url" value="jdbc:mysql://localhost:3306/test" />
				<property name="username" value="root" />
				<property name="password" value="034039" />
			</bean>
		</property>
	</bean>

	<!-- spring batch 配置jobRepository -->
	<batch:job-repository id="jobRepository"
		data-source="dataSource" transaction-manager="transactionManager"
		isolation-level-for-create="REPEATABLE_READ" table-prefix="BATCH_"
		max-varchar-length="1000" />
	<!-- spring的事務管理器 -->
	<bean id="transactionManager"
		class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
		<property name="dataSource" ref="dataSource" />
	</bean>
	<!-- batch luncher -->
	<bean id="jobLauncher"
		class="org.springframework.batch.core.launch.support.SimpleJobLauncher">
		<property name="jobRepository" ref="jobRepository" />
	</bean>
</beans>

定義的異常類：

InvalidDataException.java

package com.lyx.batch;

public class InvalidDataException extends Exception {
	private static final long serialVersionUID = 1L;

	public InvalidDataException() {
	}

	public InvalidDataException(String message) {
		super(message);
	}
}

拋出異常的processor

AllowSkipProcessor.java

package com.lyx.batch;

import org.springframework.batch.item.ItemProcessor;

public class AllowSkipProcessor implements ItemProcessor<People, PeopleDESC> {

	public PeopleDESC process(People item) throws Exception {
		System.out.println("process people desc");
		if ("lyx".equals(item.getFirstName())) {
			System.out.println("skip invalid data!!!!!!!!!!!!!!!!!!!!!!!!");
			throw new InvalidDataException("skip this data!!!!!!!!!!!!");
		}
		return new PeopleDESC(item.getLastName(), item.getFirstName(), Thread
				.currentThread().getName());
	}
}

運行結果：

process people desc

skip invalid data!!!!!!!!!!!!!!!!!!!!!!!!

process people desc

skip invalid data!!!!!!!!!!!!!!!!!!!!!!!!

任務正常完成

程序運行時間： 7526ms

我在數據庫中加了兩條數據，這兩條數據符合拋出異常的條件，當拋出異常後，沒有致使批處理的失敗，最終成功。

關於SkipPolicy的用法：http://www.cnblogs.com/gulvzhe/archive/2012/01/02/2309690.html

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